Andrew Lahde, hedge fund manager, wrote a famous and somewhat controversial goodbye letter in 2008.
He was arguably wealthy enough to take that decision and to afford expressing strong opinions.
Some statements could be interesting nonetheless:
"(...) I am content with my rewards. Moreover, I will let others try to amass nine, ten or eleven figure net worths. Meanwhile, their lives suck. Appointments back to back, booked solid for the next three months, they look forward to their two week vacation in January during which they will likely be glued to their Blackberries or other such devices. What is the point? They will all be forgotten in fifty years anyway. Steve Balmer, Steven Cohen, and Larry Ellison will all be forgotten. I do not understand the legacy thing. Nearly everyone will be forgotten. Give up on leaving your mark. Throw the Blackberry away and enjoy life. (...)"
"(...) I now have time to repair my health, which was destroyed by the stress I layered onto myself over the past two years, as well as my entire life -- where I had to compete for spaces in universities and graduate schools, jobs and assets under management (...)"